<template>
  <view
    :class="[
      styleType === 'text'
        ? 'segmented-control--text'
        : 'segmented-control--button',
    ]"
    :style="{ borderColor: styleType === 'text' ? '' : activeColor }"
    class="segmented-control"
  >
    <view
      v-for="(item, index) in values"
      :class="[
        styleType === 'text'
          ? 'segmented-control__item--text'
          : 'segmented-control__item--button',
        index === currentIndex && styleType === 'button'
          ? 'segmented-control__item--button--active'
          : '',
        index === 0 && styleType === 'button'
          ? 'segmented-control__item--button--first'
          : '',
        index === values.length - 1 && styleType === 'button'
          ? 'segmented-control__item--button--last'
          : '',
      ]"
      :key="index"
      :style="{
        backgroundColor:
          index === currentIndex && styleType === 'button' ? activeColor : '',
        borderColor:
          (index === currentIndex && styleType === 'text') ||
          styleType === 'button'
            ? activeColor
            : 'transparent',
      }"
      class="segmented-control__item"
      @click="_onClick(index)"
    >
      <text
        :style="{
          color:
            index === currentIndex
              ? styleType === 'text'
                ? activeColor
                : '#fff'
              : styleType === 'text'
                ? '#000'
                : activeColor,
        }"
        class="segmented-control__text"
        >{{ item }}</text
      >
    </view>
  </view>
</template>

<script>
/**
 * SegmentedControl 分段器
 * @description 用作不同视图的显示
 * @tutorial https://ext.dcloud.net.cn/plugin?id=54
 * @property {Number} current 当前选中的tab索引值，从0计数
 * @property {String} styleType = [button|text] 分段器样式类型
 * 	@value button 按钮类型
 * 	@value text 文字类型
 * @property {String} activeColor 选中的标签背景色与边框颜色
 * @property {Array} values 选项数组
 * @event {Function} clickItem 组件触发点击事件时触发，e={currentIndex}
 */

export default {
  name: 'UniSegmentedControl',
  props: {
    current: {
      type: Number,
      default: 0,
    },
    values: {
      type: Array,
      default() {
        return []
      },
    },
    activeColor: {
      type: String,
      default: '#007aff',
    },
    styleType: {
      type: String,
      default: 'button',
    },
  },
  data() {
    return {
      currentIndex: 0,
    }
  },
  watch: {
    current(val) {
      if (val !== this.currentIndex) {
        this.currentIndex = val
      }
    },
  },
  created() {
    this.currentIndex = this.current
  },
  methods: {
    _onClick(index) {
      if (this.currentIndex !== index) {
        this.currentIndex = index
        this.$emit('clickItem', {
          currentIndex: index,
        })
      }
    },
  },
}
</script>

<style lang="scss" scoped>
.segmented-control {
  /* #ifndef APP-NVUE */
  display: flex;
  box-sizing: border-box;
  /* #endif */
  flex-direction: row;
  height: 36px;
  overflow: hidden;
}

.segmented-control__item {
  /* #ifndef APP-NVUE */
  display: inline-flex;
  box-sizing: border-box;
  /* #endif */
  position: relative;
  flex: 1;
  justify-content: center;
  align-items: center;
}

.segmented-control__item--button {
  border-style: solid;
  border-top-width: 1px;
  border-bottom-width: 1px;
  border-right-width: 1px;
  border-left-width: 0;
}

.segmented-control__item--button--first {
  border-left-width: 1px;
  border-top-left-radius: 5px;
  border-bottom-left-radius: 5px;
}

.segmented-control__item--button--last {
  border-top-right-radius: 5px;
  border-bottom-right-radius: 5px;
}

.segmented-control__item--text {
  border-bottom-style: solid;
  border-bottom-width: 3px;
}

.segmented-control__text {
  font-size: 16px;
  line-height: 20px;
  text-align: center;
}
</style>
